my app can run without dropping frames on the X1900 (MacPro). It only
uses about 20%CPU but makes lots of use of the GPU. Since CPU usage is
so low, users like doing other things in parallel.... but get frame
drops as soon as windows are moved or other effects like exposee or
spaces are used.

Some questions:

1) Can I install a second X1900 on the MacPro and use it dedicated to
my app's renderings?
2) For final display, the results from one GPU would have to be copied
to the other. Can textures be easilly be shared among different GPUs
(shared contexts) - will the driver's handle that transparently?
3) Are these copies FAST or will the gain from using a second GPU be
possibly killed by the copies (HD1080p video, 25fps)?
4) Can I mix ATI and Nvidia GPUs in a single MacPro?

I'd like to hear if someone has done something similar. Thanks!

Mark
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